Empirical formula NH2CL molar mass = 51.5 g/mol

If the atomic mass of an atom is 34 and the atom contains 13 protons, how many neutrons does the atom contain?

Express the following number in scientific notation. 0.026890 =

Which statement best describes the relationship between period and frequency of light waves? a) in wave b the period increases and the frequency decreases from wave a. b) in wave a the period increases and the frequency decreases from wave b. c) in wave b the period is shorter and the frequency is greater than in wave a. d) in wave a the period is shorter and the frequency is greater than in wave b.